Lift or the like.



No. 767,541. PATENTED AUG. 16, 1904.

' H. D. BARLOW.

LIFT OR THE LIKE APPLICATION TILED DEO.11. 1903. no MODE-L. 4 snnnrs-snnnr 1.

lit anar- No- 767,541. PATENTED AUG. 16, 1904.

' H D. BARLOW LIFT OR THE LIKE. APPLIOATION FILED D30. 11. 1903.

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wzzgmw Luau- L PATENTED AUG. 16, 1904.

H- D. BARLOW. LIFT OR THE LIKE.

APPLIOATION FILED DEC. 11. 1903.

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l'nz erzfa-r Nol 767,541. PATEN'IED AUG} 16, 1904. H D. HARLOW LIFT OR THE LIKE.

APPLICATION FILED DBO. 11. 1903.

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Patented August 16, 1904.

HERBERT DUDLEY BARLOW,'OF LONDON, ENGLAND.

LIFT OR THE LIKE- SPECIFICATION forming part of Letters Patent No. 767,541, dated August 16, 1904.

Application filed December 11, 1903. Serial No. 184,831. (No model.)

To all whom, it may concern:

Be it known that I, HERBERT DUDLEY BAR- LoW, a subject of the King of Great Britain lowing is a specification.

The invention relates to two-point lifts and thelike of the type described in Patent No. 737,313, dated August 25, 1903, and has for its object to improve the mechanism of such lifts structurally, so that the different parts may be better adapted to withstand the forces acting upon them.

A further object of the invention is to increase the travel of the lift-cage with the same diameter of crank-circle and the same multi plying-gear.

The invention consists in a mechanism comprising crank elements or the like geared together and carrying pins on which the sheaves of a multiplying-tackle are journaled, the pins being so disposed that they approach and re cede from each other with an approximately simple harmonic motion as the wheels carrying them. rotate.

Referring to the accompanying drawings, Figure lis a plan of one form of the invention', Fig. 2 being as to its left-hand half an outside elevation and as to its right-hand half a sectional elevation on the line X X of Fig. 1. Figs. Wand 2 show other methods of anchoring and leading ofi the tackle-rope. Fig. 3 shows diagrammatically a plan of a modified form of mechanism. Fig. 4. shows a corresponding sectional elevation, while Fig. 5 is a view of another modification adapted to give a dwell at the endsof the travel of the lift-cage.

In, carrying the invention into eifect according to one form, as shown in Figs. 1 and 2, a

. worm a, mounted on the motor-shaft 6, drives a second shaft 0 by means of the worm-wheel d. The shaft 0 has two pinion-wheels 0Z rigidly secured to it, and these each gear with spur-wheels e f of equal diameter, arranged in pairs, as shown, at diametrically opposite points with regard to the aXis of the shaft 0. The shafts on which the spur-wheelse f and their centers passes through the axis.

.ing as ordinary disk cranks. A second crankpin is is similarly carried at the same radius by the other pair of wheels f. The crankpins 6 and 7c are sodisposed with relation to each other that they are equidistant from the axis of the pinion-shaft 0, while a line joining It will beobvious from considerations of symmetry .that if this is true in any one position of the gear it will be true in all positions. Hence if the sheaves m, carried by the crank-pins c'and is and round which the rope n is wound to form a multiplying-tackle, are of a diameter sufficiently greater than that of the pinionshaft 0 the falls of the tackle will in all positions of the mechanism pass clear of the pinion-shaft c.

One end of the rope is anchored to a shackle or the like, 0, the other end being taken to the lift-cage either directly or by way, for example, of a pulley p, sleeved on the shaft 0. (See Figs. 2 and 2 The shackle, if desired, may, also be sleeved on the shaft 0.

It will be seen that as the spur-wheels e and f revolve the crank-pins z' and k approach and recede from each other with an approximately simple harmonic motion which is copied by the lift-cage on an enlarged scale.

The form of the invention just described is suitable for lifts of a heavy nature, as overhung parts can be avoided and double bearings provided in all cases. It will be seen, however, that if overhung parts are not con-' sidered undesirable the wheels 6 f and other parts do not need to be in duplicate. For equal diameters of the crank-pin circles it will be seen that compared to the form of mechanism described in the former patent referred to above the travel of the lift-cage is doubled. i

Referring to Figs. Sand 4,,a modified form L are geared directly together, and thus revolve in opposite directions. The crank-pins iand 7c are so set that the line joining them is parallel to the line through the centers of the wheels. 0 and f, while at the same time the crank-pins are at equal distances from the point of contact of the pitch-circles of these wheels. This modification also leads to an efiicient structural disposition of parts.

Referring to Fig. 5, another modification is shown diagrammatically in which two independent ropes or n are adopted, each operated from its own crank-pins 2' 7t and 2" 7r, respectively, the two pairs of crank-pins being slightly out of phase, as shown. The pairs of crank-pins shown in full and dotted lines in the figure are each mounted on their own separate wheel-cranks, all ,four of which are driven from the one pinion-shaft indicated if the gearing of Figs. 1 and 2 be adopted. The ropes are attached not directly to the cage 8, but to each end, respectively, of a rocker or the like, 2?, pivoted to the cage at its center point. The effect of this arrangement is that a dwell is secured at each end of the travel of the cage, a point which is of considerable importance in the case of continuously-running lifts.

It will be evident without further description that the modification of Figs. 3 and 4 may equally well be arranged with duplicate tackle and rocker. Any of the described methods of anchoring and leading off the cageropes may also be adopted.

An electric motor 9' is shown for driving the mechanism described; but power may be supplied in any other convenient manner.

It will be seen that overrunning in a lift of this description is impossible. Starting and stopping take place gradually, while the direction of the motor does not need to be reversed.

Having now described my invention, what 1 claim as new, and desire to secure by Letters Patent, is

1. A lift mechanism comprising, in combination, crank elements geared together; means for rotating said crank elements; crank-pins mounted on parts of said crank elements which alternately recede from and approach one another, together with tackle connecting said crank-pins to the cage to be operated.

2. A lift mechanism comprising, in combination, crank elements geared together, means for rotating said crank elements, crank-pins mounted on parts of said crank elements which alternately recede from and approach one another, sheaves journaled on said crank-pins together with a multiplying tackle wound round said sheaves and connected to the cage to be operated.

3. A two-point lift mechanism comprising, in combination, crank elements geared together, so as to rotate in the same direction; means for rotating said crank elements;

crank-pins mounted on oppositely-movable parts of said crank elements; sheaves journaled on said crank-pins together with a multiplying-tackle wound round said sheaves and connected to the cage to be operated.

4. A two-point lift mechanism comprising, in combination, spur-wheel cranks; a shaft disposed directly between said wheel-cranks, pinion wheels mounted on said shaft, and gearing with said wheel-cranks, means for rotating said pinion-shaft; crank-pins mounted on said cranks, said crank-pins being disposed in side elevation, on a straight line through the center of said pinion-shaft and at equal distances from said center; sheaves journaled on said crank-pins together with multiplyingtackle wound round said sheaves and connected to the cage to be operated, substantially as set forth.

5. A two-point lift mechanism comprising, in combination, two pairs of spur wheel cranks, bearings on the outer sides of each coaxial pair; a shaft disposed directly between said wheel-cranks; pinion-wheels mounted on said shaft and gearing with said wheel-cranks; bearings for said shaft on the outer sides of said pinions; means for rotating said shaft; crank-pins mounted on and between said coaxial pairs of wheel-cranks, one to each pair, said crank-pins being disposed in side elevation on a straight line through the center of said pinion-shaft and at equal distances from said center; sheaves journaled on said crankpins together with multiplying-tackle wound round "said sheaves and connected to the cage to be operated, substantially as set forth.

6. A two-point lift mechanism comprising, in combination, two pairs of spur wheel cranks, hearings on the outer sides of each coaxial pair; a shaft disposed directly between said wheel-cranks; pinion-wheels mounted on said shaft and gearing with said wheel-cranks; bearings for said shaft on the outer sides of said pinions; means for rotating said shaft; crank-pins mounted on and between said coaxial pairs of wheel-cranks, one to each pair, said crank-pins being disposed in side elevation on a straight line through the center of said pinion shaft and at equal distances from said center; sheaves journaled on said crankpins; a sleeve element rotatably mounted on said pinion-shaft together with multiplyingtackle wound round said sheaves and connected to the cage to be operated, one end of said tackle being anchored to said sleeve element, substantially as set forth.

7. A two-point lift mechanism comprising,

in combination, two pairs of spur-wheel cranks, hearings on the outer sides of each coaxial pair; a shaft disposed directly between said wheel-cranks; pinion-wheels mounted on said shaft and gearing with said wheel-cranks; bearings for said shaft on the outer sides of said pinions; means for rotating said shaft; crank-pins mounted on and between said coaxial pairs of wheel-cranks, one to each pair, said crank-pins being disposed in side elevation on a straight line through the center of said pinion-shaft and at equal distances from said center; sheaves journaled on said crankpins; a sleeve element and a pulley rotatably mounted on said pinion-shaft together with multiplying-tackle wound round said sheaves and connected by way of saidpulley to the car to be operated, one end of said tackle being secured to said sleeve element, substantially as set forth.

8. In lift mechanism in which the cage receives a harmonic motion from one or more cranks, means for giving the cage a dwell at the ends of its travel, consisting in combination of crank-pins revolving out of phase togetherwith sets of tackle connected between ends of said rocker, substantially as set forth. 3

In witness whereof I have hereunto set my hand in presence of two witnesses;

HERBERT DUDLEY BARLOW. Witnesses:

ALBERT E. PARKER, ALBERT E. CooKERELL. 

